Crushing and grinding mill.



A. CALDOGNETTO.

CRUSHING AND GRINDING MILL.

APPLICATION FILED JULY 22. 1913.

' 1,088,876. Patented Mar.3,1914.

3 SHEBTS-SHEET L @Mum/:Toa 62X) L Emea ses A. CALDOGNETTO.

C'RUSHING AND GRINDING MILL.

APPLICATION FILED JULY 2z, 1913.

1,088,876.- f Patented Mar.3,1914.

3 SHEETS-SHEET 2.

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lA. CALDOGNETTO. ORUSHING AND GRINDING MILL.

APPLICATION IILED JULY 22, 1913.

1,088,876, Y Patented Mar.3,1914.

3 SHEETS-SHEET 3.

Il!! l//"\\ 53m/vento@ Wmme-ao Za/lzwra [7.1.2470] w o CID ALEJANDROCALDOGNETTO, OF BUENOS AIRES, ARGENTINA.

CRUSHING AND (vi-BINDING MILL.

Specification of Letters Patent.

Patented Mar. 3, 1914.

Application led July 22. 1913. Serial No. 780,447.

To all Lo/wm it may concern:

Be it known that I, ALEJANDRO CALDoe- NETTO, a subject of the King ofItaly, residing at No. 21.81 Bustamante street, Buenos Aires, Argentina,have invented certain new and useful Improvements in Crushing andGrinding Mills, of which the following is a specication.

This invention relates to a novel grinding and crushing machine,particularly adapted for grinding salt and similar materials. Withregard to the grinding of salt, the machine which forms the subjectmatter of this invention, offers many advantages over all the machinesof this kind heretofore used because it yields a considerable amount ofwork with a minimum consumption of power. With the apparatus constructedin accordance with the present invention, within a period of 9 hours,10,000 kgs. of common rock salt may be ground with a con sumption ofmotive power of ls-1. hp., while with any of the machines actually inuse, in order to grind the same amount, from 70 to 8O hp. would berequired, for an equal length of time.

It is also an object of the present invention to provide means wherebythe salt may etliciently be ground irrespective of its condition, thatis to say, no matter whether it is damp or dry. This is a fact of muchi1n portance as, owing to the hygroscopic properties of Chlorid ofsodium or common salt, it is always a matter of serious difficulty toproceed to grind the salt when the atmosphere is moist or if on accountof any other circumstance theV salt has come in contact with any liquid.

Besides the advantages already stated, the present salt grinding machineis adapted to be adjusted so that the salt may be ground to any desireddegree of fineness, bv means of a screw device which controls theposition of the fixed knife or cutter in relation to the moving cutters,as will hereinafter be fully described. Moreover, if desired, the groundproduct may at the same time contain tine and coarser particles, ofdifferent grades, without the necessity of changing the relativepositions of the cutters, all as will later on be explained inconnection with the working of the machine.

For the sake of clearness and in order to facilitate the understandingof this invention, illustrative drawings have been anneXed to thisspecification which show by way 0f example the manner of carrying theinvention into practice.

In said drawings, Figure 1 is a horizontal section of the machineshowing the essential parts of which the same is formed. Fig. 2 is avert-ical section of the machine, on the line of its axis of rotation,and Fig. 3 is a vertical section perpendicular to that 0f Fig. 2,wherein may be clearly seen the toothed crown and cutter' knives, aswell as the adjusting device for regulating the distance` on aremounted, at the side corresponding to the direction of rotation, theknives or cutters 17, made 0f steel. At the Lipper part of the machine,see Fig. 3, is arranged the charging hopper 5 through which the raw saltis fed into the interior of the grinding chamber, the walls of thischamber being formed by the casing 10. G indicates a toothed crownarranged within the said grinding chamber 0n the inside of the cover,the wooden teeth of the crown being inclined in the direction in whichthe shaft is rotated. The crown is disposed eccentrically with relationto the disks 2, with its lower end nearer thereto than its upper end, soas to produce a gradual reduction of the salt, and its teeth serve toretain the salt and te effect a preliminary crushing of the same byimpact as it is being fed into the machine.

7 is a block of wood which is hinged `or pivoted in the bottom of thegrinding chainber, and is raised or lowered through the agency of ascrew 8 operated by means of a hand wheel 9. 1

The shaft 1 is supported by means of the bearings 11 and brasses12,`and1to`tl1e shaft are keyed the two pulleys `13` andthe twofly-wheels 14.

15 is the discharge outlet for the ground salt. l l

- grades of the salt'. Y s .The'apparatus is entirely constructed ofwood,.fexcepting of course, the steel cutters 16 is an orifice for theentrance of air for the purpose of creating a Ventilating air currentand of efficiently assisting the discharge of the ground salt throughthe out-- let 15. Y

18 is a fixed knife or cutter of steel, se-

. cured to the block 7 and acting tangentially with relation to therotary cutters 17.

After having thus described the essential parts of the apparatus, Ishall now proceed to explain the operation of the same.

The central shaft 1 being started by means of the pulleys 13 whichreceive the motive power fromV any convenient source, common rock saltyis fed into the machine through the hopper 5. The rapid rotatorymovement ofthe cutters 17, together with the airY current createdthereby and by the small air chambers 4L, will cause the salt to bedrawn along toward the toothed crown 6, and by impacting against thesame, it will be partially crushed up and will fall upon the block 7 .atthe bottom of the vgrinding chamber. The position of this block, that isto say, the position of the Xed cutter 18 with relation to .the rotarycutters 17 is previously arranged and conveniently adjusted by means ofthe screw 8 andthe hand wheel 9, so as to cause the final product to beof the desired degree of ineness. When a layer of l'partially groundsalt has been deposited on the block 7, the passage of the rotary cutter17 past the fixed cutter 18 will remove therefrom the particles of saltwhichV are of the desired degree of fineness, and such particles will bedrawn through and carried outside of the chamber, owing to the strongsuction produced in said chamber by the rotatory motion of the cutters17 and of the wooden disks 2, the air being drawn into said `chamber ata high speed through the inlet 16. This entrance of air absolutelyprevents any ground salt from falling through the said inlet 16, thesalt being, caused to issue with great force through the outlet 15, andfalling at a distance therefrom which varies from 4 to 10 meters,according to the degree of ineness of the ground product. It is evidentthat the finer the salt, the farther it will deposit on being drawnalong by the air current. In view of this fact, a box consistingofseveral compartments may conveniently be placed before the saidoutlet, so that the said lcompartments will receive the different.

and the bearings, shaft, pulleys, iynvheels .and the device forregulating the neness of the' producti Y' By, constructing the apparatusofwood,-the`saltcannot come into cont-act I with any metallic surfacesto which it might charge outlet and of the air inlet may be varied atwill, without departing from this invention. The outer part of theapparatus, may if desired, also be made of one piece, but it ispreferred to construct the same of two or more pieces, arranged to'beVreadily dismounted, for the purpose of cleaning the same.

I declare that what I claim Aand desire to secure by Letters Patent, is:

1. In a grinding mill, the combination, with a casing having inlets forair andthe material to be ground, and a discharge outlet located betweensaid in'lets;`of coperating, stationary and rmovable grinding elementsarranged within said casing; and means forrotating the movable grindingclement, to draw air continuously through the air inlet into saidcasing, and force it therefrom with the ground material through saidoutlet. y

Q. In a grinding mill, the combination of a rotatable disk provided atdiametrically opposed points with a pair of knives; lneans for rotatingsaid disk; a block pivoted at one end beneath said disk and providedwith a knife coperative with the` first-named knives; and avertically-arranged screw upon which the other end of the block is namedelement, to draw air continuously through the air inlet into said casingand said air chambers, and force it therefrom with the ground material.through said outlet. n

In testimony whereof I aflix my signature in presence of two witnesses.

ALEJANDRO CALDOGNETTO. Witnesses: Y

J. II. AINSWORTH,

N. BARTLEY.

@Genies ef this patent may be obtained for ve cents each, byaddressingthe Commissioner of latents.

Washington, D. G.

